Xiaomi Mi 4 can t be charged after changing the screen, the original screen is connected to the powe

1. The boot line is abnormal: use an external power supply to supply power to the mobile phone, use the electric meter to detect whether the indication has changed, if there is no change, it is likely that the boot line is broken or the boot button is not in good contact.

2. The power supply circuit of the battery is abnormal: use the external interface to supply power to the mobile phone, see if it returns to normal when it is turned on, if it is normal, it is determined that the power supply circuit of the mobile phone is abnormal.

3. The IC of the mobile phone power supply is abnormal: test the test point of the peripheral circuit of the power supply IC according to the circuit schematic diagram to see whether the test value is normal.

4. The system clock and reset of the mobile phone are abnormal: you can use the dual total oscilloscope to detect the CPU power supply of the mobile phone to check whether the waveform in the reset is correct.

5. Problems with logic circuits: that is, faults in the circuit version of mobile phones, which can generally be solved by repair welding.

6. Software conflict: The installed software does not match the system of the mobile phone, which may also cause the mobile phone to fail to boot, you can connect the mobile phone to the computer to delete the program.

7. If it is a copycat mobile phone, then I estimate that it can't be turned on because the chip inside is burned, or some of the small parts inside are loose, but this situation will only appear if you drop it, the chip burns may be because you charge it for too long, burn the chip, if the battery has electricity, that is these aspects, if it is a brand-name mobile phone, such as Nokia, Motorola. These situations are rare, unless it is artificial, if it is a brand-name smartphone, and it is not used improperly, it is a software problem, it may be a system crash, or because of the mobile phone poisoning caused by software damage, generally this can only go to the maintenance office, however, I think the biggest possibility is caused by static electricity, it is recommended that you do not open the blind repair, or go to the maintenance office!

If such a problem occurs, it may be that the charging interface of the mobile phone is not in good contact, or there is a problem with the mobile phone battery, which causes it to not be charged. So it can't be turned on.

1. If the charging interface of the mobile phone is not easy to use, it is possible that the tail port of the mobile phone is not in good contact and the charging is not good, or the data cable is damaged and the charging is not good.

2. If it is a problem with the mobile phone battery, you can bring the mobile phone to Xiaomi after-sales service for testing and maintenance, and the processing can be successful, and the mobile phone can be restored to normal charging, so that it can be successfully turned on.

Hello. When the phone won't turn on, can't charge and flashes a red light, it's time for the battery to sleep. Solution: The battery is dormant, please use the universal charge to charge the battery to try (meter 3 meters 4 can not use this method), or connect to the computer to charge for half an hour to start up, if it still doesn't work, please go to Xiaomi Home to activate the battery Xiaomi Home.

Authorized repairer outlets.

Hello , my phone is the same problem as yours Please how did you solve it See it please reply Thank you.

1. It may be caused by poor contact of the charging line, you can reconnect the charging line to ensure that the line is unblocked.

2. It may also be that there is a problem with the charger or data cable, you can change the charger or change the data cable to recharge it.

3. If there is a problem with the mobile phone system, you can try to press and hold the power button and the volume button to see if you can enter the recovery mode.

4. If you can't, you can try to connect to the computer and use the miflash software to flash the complete system package for the phone.

5. After trying the above methods, if the problem cannot be solved, it may be caused by the hardware failure of the mobile phone, mainly the battery failure, charging port failure, internal circuit failure, motherboard chip and other component failure, etc., you can change the battery to try, and if you still can't turn on the phone, you need to contact Xiaomi's after-sales service to test and repair the mobile phone to solve it.

If the motherboard or charging board is broken, repair it after sale.

The battery should be broken, take it to the mobile phone store and try to replace the battery.

The solution to the "Xiaomi 4" not charging:

If the battery is exhausted and cannot be turned on, it is recommended to use the charger to charge for 15 to 30 minutes, and you can try to turn on the phone after the LED light is always on;

If possible, you can try to replace it with another Xiaomi battery to see if it can be charged normally;

Xiaomi Mi 4 "Won't Charge:

1.The battery of Xiaomi mobile phone cannot be charged, and it is possible that the battery has entered a dormant state. This is mostly caused by the user running out of power and the phone automatically shuts down.

The solution to this situation is to remove the battery, wait 5 minutes, and then reinstall the battery. Use a data cable to connect your Mi phone to the computer, and after 30 minutes, turn it back on.

2.In the case of sudden Xiaomi mobile phone battery not charging, we also need to check whether we are using a regular original Xiaomi charger. If you are using a different charger, you need to check if there is a problem with the charger or if the charger port is damaged.

Changing to a new Xiaomi charger will solve this situation.

3.If there is a situation where the mobile phone can be connected to the charger to charge, but it is always not fully charged, we need to check whether there is something wrong with the mobile phone system. Sometimes, we install some battery management software to protect the battery of our phones, and when there is a problem with these software, the battery will not be fully charged.

We can charge the phone battery with a universal charger and so on, and check if the battery is damaged. If the battery can be fully charged through universal charging, then we should repair the phone system, or flash the phone.

4.In addition to the above situations, the loose charging interface of the mobile phone and the short circuit of the internal charging circuit of the mobile phone will also cause the battery of the Xiaomi mobile phone to not be charged. In this case, we need to send our Xiaomi mobile phone to a professional Xiaomi after-sales maintenance network for maintenance.

The following possibilities are given for your situation:1The charger is broken, you can change it or see if there is any power.

2 batteries are broken. I haven't used Xiaomi, I don't know if the battery is removable, if it can be removed, then take it down and replace it with a battery. 3.

The mobile phone system is broken, but even the computer does not respond, so this possibility is relatively low. 4 Most likely, and worst likely, the motherboard burns due to misoperation (such as removing the battery in the boot state).

Hi! It is estimated that the battery is dormant.

It is recommended that you go to a Xiaomi authorized service point for inspection and repair. Check the address of your local Xiaomi authorized repair point.

It's a broken charging interface, and it's 130 yuan to repair and replace a small board.

The charging port is broken, go to the store and get a new one.

Suspended animation! Press the three keys together for 15 seconds, if you can't turn it on, then disassemble the battery cable and connect it again (it's very easy to disassemble, as long as you have a screwdriver). ok

Mine too, what's going on?

Wait a minute, I've had this with Mi 3. Battery hibernation. The phone didn't respond. After a night, you can charge up. It really can't be repaired again.

Press the volume up button and the power button at the same time to enter the recovery mode.

Go to the after-sales service to see, it may be that the motherboard is broken.

Hi! According to your description, please go to a repair center near you or Xiaomi Home to check it.

Mi Home is open from Tuesday to Sunday, from 10 a.m. to 6 p.m. During the warranty period, non-man-made damage can be repaired free of charge.

If you don't have a branch near you, please go to Xiaomi's official website.

Plug in the computer and try it, if it doesn't work, send it for repair.

Send it to the repair shop and explain the situation. Go to the store where you bought it.

The phone can't be turned on when the phone is charged with a red light, you can follow the steps below:

1. If the battery is exhausted and cannot be charged, you need to check the battery, charger, and charging cable.

2. Use the replacement method to determine which link is problematic, replace the faulty link, and ensure that the battery can be charged and the power is sufficient.

3. If the battery is good and the power is sufficient, it is generally a problem with the mobile phone, you can unplug the battery and reinstall it to see if it can be turned on normally.

4. If you can't turn it on, you can try to brush the machine, and there is information on the Internet and the official *** to do it.

5. Flash the machine to enter recovery. How to enter recovery: In the shutdown state, press the "volume up button" and "shutdown button" at the same time, and let go when the screen appears, you can enter recovery.

If you can enter Recovery, switch the system under Recovery and back up your data, if it can't be successful, you need to erase all your data (your contacts, text messages, phone apps, etc. will disappear).

6. Whether it can enter fastboot. How to enter fastboot: In the shutdown state, first press and hold the "meter key", then press and hold the "volume down button" and then press and hold the "shutdown button", and let go when the screen appears, you can enter fastboot.

Connect the mobile phone to the computer and flash a complete system package with the method of miflash.

8. If it is still invalid, you can only find after-sales service.

You can press the up and down volume keys and the power button at the same time, and it should be fine to hold on for a while.

If the charging is red, it means that it is a virtual electricity, and it will be turned on after an hour, and it will be fine. If it doesn't work, your battery is broken!

Are you running out of battery?

If the red light is on, it should be charging, but try charging overnight and wait for the light to turn on again.